Create count_primes.js

Author: Jaskaran Singh

count_primes.js

@@ -0,0 +1,20 @@
+// /**
+//  * @param {number} n
+//  * @return {number}
+//  */
+
+var countPrimes = function(n) {
+    if (n == 0 || n == 1) return 0
+    
+    let count = 0
+    for (let i = 2; i < n; i++) if(isPrime(i)) count++
+    return count
+};
+
+const isPrime = n => {
+    if (n == 2) return true
+    for (let i = 2; i <= Math.sqrt(n); i++) 
+        if (n % i == 0) return false
+    
+    return true
+}